I build complete web products: polished React interfaces, type-safe APIs, secure data models and the AWS infrastructure behind them. I also create practical tools for running AI-assisted development without losing context, review or engineering discipline.
14+
Years Building
2.5M
Downloads
7
Major Versions
1400
Support Tickets
End-to-end product engineering, grounded in more than a decade of building tools people rely on.
Current Focus
Specializations
14+ Years
Deep experience with the browser, the web platform and the technologies that keep production software maintainable.
That foundation now supports broader work across SaaS products, cloud infrastructure and developer tooling — without losing sight of performance or the people using the product.
Building for Developers
Start with the user's real problem. Choose technology that makes the system easier to understand and operate. Use AI to expand capacity, while keeping architectural judgment, review and testing firmly in the loop.
User first
Selected product, platform and developer-tool work — from visual CSS engineering to multi-tenant SaaS and AI-assisted delivery.
Trusted by developers worldwide. Real feedback from the community that uses Microthemer every day.
"Long-time user and fan of both the product and Sebastian, its developer. Microthemer is an incredibly well-thought-out tool that provides new u..."
WebWorX Limited
ProductHunt User
"Ive been a user since November 2021. I can remember pre-purchase thinking if I really needed this tool or not. Im very glad I proceeded with th..."
glenhouse46
ProductHunt User